[RichardZite]

Good news @Sfi81, there are some tools for this. If you want to plan ahead and do that in detail or just sketch around with freehand drawings you have the ultimate zoomable whiteboard at your service which works in every browser. Give it a try at https://ziteboard.com Let me know if you need help with it.

[Sfi81]

Thanks! it does looks interesting as I've tried using Prezi for this sort of stuff before but tripped on its "presentation focused" features whereas this seems more flexible